Shower curtain



FIG. 1 is a front side perspective view of a shower curtain, showing my new design;

FIG. 2 is a front elevation view thereof.

FIG. 3 is a back elevation view thereof;

FIG. 4 is a right side elevation view with the left side elevation view being a mirror image thereof;

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom plan view. 

CLAIM The ornamental design for a shower curtain, as shown and described. 